Pilkington Glass

Reduce your carbon footprint: If your existing UPVC windows were installed prior to 2003 then they will probably not have Pilkington 'K' Glass. You can replace the glass units to incorporate Pilkington 'K' Glass thus reducing the amount of energy lost through the glass. Pilkington K Glass™


UK's leading solution for thermal insulation in homes and public buildings, Pilkington K Glass™ is a low emissivity coated glass which is easily stocked, processed and installed. Pilkington K Glass™ has been established for more than 15 years making it the trusted solution for meeting energy efficiency Building Regulations. Pilkington K Glass™ usually forms the inner pane of an Insulating Glass Unit (IGU) such as Pilkington Insulight™. The coating reflects heat back into the room whilst also letting in free heat from the sun known as passive solar gain. Pilkington K Glass™ helps windows to achieve high Window Energy Ratings to demonstrate compliance with energy saving Building Regulations Part L.


  1. Recognised by the Energy Saving Trust as a significantly effective measure for achieving energy efficiency hence savings on fuel bills.
  2. Ideal for conservatories - helps to keep an unheated conservatory comfortable for a greater part of the year than ordinary double-glazing allowing you to make the most of your conservatory all year round.
  3. Helps to achieve high Window Energy Ratings when combined in a suitable framing system.
  4. Easily helps to meet and exceed the requirements of Building Regulations concerning energy efficiency.
  5. Can be toughened or laminated for safety and greater security.
  6. Can be combined with other Pilkington products such as Pilkington Activ™ or Pilkington Activ™ Blue for self-cleaning and solar control.

How it Works

The glass in your windows absorbs heat then radiates it again on the colder, outside, surface. Pilkington K Glass™ has a so-called low emissivity coating which is positioned on surface 3 (counting from the outside) of the Insulating Glass Unit (IGU). The low emissivity coating is a poor radiator of heat. So the heat absorbed by the coated glass does not travel across the air gap to the outer pane and the cold outside world. Instead the coating reflects the heat back into the room. Windows incorporating Pilkington K Glass™ allow heat from the sun through and keep heat inside, making it easier and more cost effective to keep buildings warm.